Nipple guard



FIG. 1 is a front elevational view of a nipple guard, showing my new design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a cross-sectional view thereof, taken along line 3--3 of FIG. 2;

FIG. 4 is a right side elevational view thereof, the left side elevational view being identical thereto;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a nipple guard, as shown. 